To simplify later changes to page tag references, introduce new pgalloc_tag_ref and pgtag_ref_handle types. This allows easy replacement of page_ext as a storage of page allocation tags
Signed-off-by: Suren Baghdasaryan <[email protected]> --- include/linux/pgalloc_tag.h | 144 +++++++++++++++++++++++------------- lib/alloc_tag.c | 3 +- 2 files changed, 95 insertions(+), 52 deletions(-) diff --git a/include/linux/pgalloc_tag.h b/include/linux/pgalloc_tag.h index 244a328dff62..c76b629d0206 100644 --- a/include/linux/pgalloc_tag.h +++ b/include/linux/pgalloc_tag.h @@ -9,48 +9,76 @@ #ifdef CONFIG_MEM_ALLOC_PROFILING +typedef union codetag_ref pgalloc_tag_ref; + +static inline void read_pgref(pgalloc_tag_ref *pgref, union codetag_ref *ref) +{ + ref->ct = pgref->ct; +} + +static inline void write_pgref(pgalloc_tag_ref *pgref, union codetag_ref *ref) +{ + pgref->ct = ref->ct; +} #include <linux/page_ext.h> extern struct page_ext_operations page_alloc_tagging_ops; -static inline union codetag_ref *codetag_ref_from_page_ext(struct page_ext *page_ext) +static inline pgalloc_tag_ref *pgref_from_page_ext(struct page_ext *page_ext) { - return (union codetag_ref *)page_ext_data(page_ext, &page_alloc_tagging_ops); + return (pgalloc_tag_ref *)page_ext_data(page_ext, &page_alloc_tagging_ops); } -static inline struct page_ext *page_ext_from_codetag_ref(union codetag_ref *ref) +static inline struct page_ext *page_ext_from_pgref(pgalloc_tag_ref *pgref) { - return (void *)ref - page_alloc_tagging_ops.offset; + return (void *)pgref - page_alloc_tagging_ops.offset; } +typedef pgalloc_tag_ref *pgtag_ref_handle; + /* Should be called only if mem_alloc_profiling_enabled() */ -static inline union codetag_ref *get_page_tag_ref(struct page *page) +static inline pgtag_ref_handle get_page_tag_ref(struct page *page, union codetag_ref *ref) { if (page) { struct page_ext *page_ext = page_ext_get(page); - if (page_ext) - return codetag_ref_from_page_ext(page_ext); + if (page_ext) { + pgalloc_tag_ref *pgref = pgref_from_page_ext(page_ext); + + read_pgref(pgref, ref); + return pgref; + } } return NULL; } -static inline void put_page_tag_ref(union codetag_ref *ref) +static inline void put_page_tag_ref(pgtag_ref_handle pgref) { - if (WARN_ON(!ref)) + if (WARN_ON(!pgref)) return; - page_ext_put(page_ext_from_codetag_ref(ref)); + page_ext_put(page_ext_from_pgref(pgref)); +} + +static inline void update_page_tag_ref(pgtag_ref_handle pgref, union codetag_ref *ref) +{ + if (WARN_ON(!pgref || !ref)) + return; + + write_pgref(pgref, ref); } static inline void clear_page_tag_ref(struct page *page) { if (mem_alloc_profiling_enabled()) { - union codetag_ref *ref = get_page_tag_ref(page); - - if (ref) { - set_codetag_empty(ref); - put_page_tag_ref(ref); + pgtag_ref_handle handle; + union codetag_ref ref; + + handle = get_page_tag_ref(page, &ref); + if (handle) { + set_codetag_empty(&ref); + update_page_tag_ref(handle, &ref); + put_page_tag_ref(handle); } } } @@ -59,11 +87,14 @@ static inline void pgalloc_tag_add(struct page *page, struct task_struct *task, unsigned int nr) { if (mem_alloc_profiling_enabled()) { - union codetag_ref *ref = get_page_tag_ref(page); - - if (ref) { - alloc_tag_add(ref, task->alloc_tag, PAGE_SIZE * nr); - put_page_tag_ref(ref); + pgtag_ref_handle handle; + union codetag_ref ref; + + handle = get_page_tag_ref(page, &ref); + if (handle) { + alloc_tag_add(&ref, task->alloc_tag, PAGE_SIZE * nr); + update_page_tag_ref(handle, &ref); + put_page_tag_ref(handle); } } } @@ -71,53 +102,58 @@ static inline void pgalloc_tag_add(struct page *page, struct task_struct *task, static inline void pgalloc_tag_sub(struct page *page, unsigned int nr) { if (mem_alloc_profiling_enabled()) { - union codetag_ref *ref = get_page_tag_ref(page); - - if (ref) { - alloc_tag_sub(ref, PAGE_SIZE * nr); - put_page_tag_ref(ref); + pgtag_ref_handle handle; + union codetag_ref ref; + + handle = get_page_tag_ref(page, &ref); + if (handle) { + alloc_tag_sub(&ref, PAGE_SIZE * nr); + update_page_tag_ref(handle, &ref); + put_page_tag_ref(handle); } } } static inline void pgalloc_tag_split(struct page *page, unsigned int nr) { - int i; - struct page_ext *first_page_ext; - struct page_ext *page_ext; - union codetag_ref *ref; + pgtag_ref_handle first_pgref; + union codetag_ref first_ref; struct alloc_tag *tag; + int i; if (!mem_alloc_profiling_enabled()) return; - first_page_ext = page_ext = page_ext_get(page); - if (unlikely(!page_ext)) + first_pgref = get_page_tag_ref(page, &first_ref); + if (unlikely(!first_pgref)) return; - ref = codetag_ref_from_page_ext(page_ext); - if (!ref->ct) + if (!first_ref.ct) goto out; - tag = ct_to_alloc_tag(ref->ct); - page_ext = page_ext_next(page_ext); + tag = ct_to_alloc_tag(first_ref.ct); for (i = 1; i < nr; i++) { - /* Set new reference to point to the original tag */ - ref = codetag_ref_from_page_ext(page_ext); - alloc_tag_add_check(ref, tag); - if (ref) { - ref->ct = &tag->ct; + pgtag_ref_handle handle; + union codetag_ref ref; + + page++; + handle = get_page_tag_ref(page, &ref); + if (handle) { + /* Set new reference to point to the original tag */ + alloc_tag_add_check(&ref, tag); + ref.ct = &tag->ct; /* * We need in increment the call counter every time we split a * large allocation into smaller ones because when we free each * part the counter will be decremented. */ this_cpu_inc(tag->counters->calls); + update_page_tag_ref(handle, &ref); + put_page_tag_ref(handle); } - page_ext = page_ext_next(page_ext); } out: - page_ext_put(first_page_ext); + put_page_tag_ref(first_pgref); } static inline struct alloc_tag *pgalloc_tag_get(struct page *page) @@ -125,13 +161,15 @@ static inline struct alloc_tag *pgalloc_tag_get(struct page *page) struct alloc_tag *tag = NULL; if (mem_alloc_profiling_enabled()) { - union codetag_ref *ref = get_page_tag_ref(page); - - alloc_tag_sub_check(ref); - if (ref) { - if (ref->ct) - tag = ct_to_alloc_tag(ref->ct); - put_page_tag_ref(ref); + pgtag_ref_handle handle; + union codetag_ref ref; + + handle = get_page_tag_ref(page, &ref); + if (handle) { + alloc_tag_sub_check(&ref); + if (ref.ct) + tag = ct_to_alloc_tag(ref.ct); + put_page_tag_ref(handle); } } @@ -146,8 +184,12 @@ static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) #else /* CONFIG_MEM_ALLOC_PROFILING */ -static inline union codetag_ref *get_page_tag_ref(struct page *page) { return NULL; } -static inline void put_page_tag_ref(union codetag_ref *ref) {} +typedef void *pgtag_ref_handle; + +static inline pgtag_ref_handle +get_page_tag_ref(struct page *page, union codetag_ref *ref) { return NULL; } +static inline void put_page_tag_ref(pgtag_ref_handle handle) {} +static inline void update_page_tag_ref(pgtag_ref_handle handle, union codetag_ref *ref) {} static inline void clear_page_tag_ref(struct page *page) {} static inline void pgalloc_tag_add(struct page *page, struct task_struct *task, unsigned int nr) {} diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c index 19ef02a18611..53bd3236d30b 100644 --- a/lib/alloc_tag.c +++ b/lib/alloc_tag.c @@ -5,6 +5,7 @@ #include <linux/gfp.h> #include <linux/module.h> #include <linux/page_ext.h> +#include <linux/pgalloc_tag.h> #include <linux/proc_fs.h> #include <linux/seq_buf.h> #include <linux/seq_file.h> @@ -436,7 +437,7 @@ static __init void init_page_alloc_tagging(void) } struct page_ext_operations page_alloc_tagging_ops = { - .size = sizeof(union codetag_ref), + .size = sizeof(pgalloc_tag_ref), .need = need_page_alloc_tagging, .init = init_page_alloc_tagging, }; -- 2.46.0.469.g59c65b2a67-goog
